Wealth gap: A guide to what it is, why it matters

A destitute man sleeps on the sidewalk in November under a holiday window at Blanc de Chine in New York. From the White House to the Vatican to the business elite in Davos, Switzerland, one issue keeps seizing the agenda: the growing gap between the very wealthy and everyone else. A Gallup poll found two-thirds of Americans are dissatisfied with the nation's distribution of wealth.